Fix AudioDebugRecording*Tests to use isolated temporary directories.

https://chromium-review.googlesource.com/881501 introduced fixed file
paths into some of these tests, causing them to randomly interfere with
one another if they happened to end up being run in parallel.

Bug: 809780
TBR: olka@chromium.org
Change-Id: Idb2143f9c44ddab559b7402182e69d3b2e7220de
Reviewed-on: https://chromium-review.googlesource.com/905991Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534893}

media/audio/audio_debug_recording_helper_unittest.cc

@@ -11,6 +11,7 @@
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
+#include "base/files/scoped_temp_dir.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
@@ -144,10 +145,10 @@ class AudioDebugRecordingHelperTest : public ::testing::Test {
     // Check that AudioDebugRecordingHelper::EnableDebugRecording adds file
     // extension to file name suffix.
     EXPECT_EQ(file_name_suffix_.AddExtension(kFileExtension), file_name_suffix);
-    base::FilePath temp_dir;
-    ASSERT_TRUE(base::GetTempDir(&temp_dir));
+    base::ScopedTempDir temp_dir;
+    ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
     base::FilePath base_file_path(
-        temp_dir.Append(base::FilePath(kBaseFileName)));
+        temp_dir.GetPath().Append(base::FilePath(kBaseFileName)));
     base::FilePath file_path =
         base_file_path.AddExtension(file_name_suffix.value());
     base::File debug_file(base::File(

media/audio/audio_debug_recording_session_impl_unittest.cc

@@ -8,6 +8,7 @@
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
+#include "base/files/scoped_temp_dir.h"
 #include "base/test/scoped_task_environment.h"
 #include "media/audio/mock_audio_debug_recording_manager.h"
 #include "media/audio/mock_audio_manager.h"
@@ -85,12 +86,12 @@ class AudioDebugRecordingSessionImplTest : public testing::Test {
 
  private:
   void SetBaseFilePath() {
-    base::FilePath temp_dir;
-    if (!base::GetTempDir(&temp_dir))
-      FAIL();
-    base_file_path_ = temp_dir.Append(base::FilePath(kBaseFileName));
+    CHECK(temp_dir_.CreateUniqueTempDir());
+    base_file_path_ = temp_dir_.GetPath().Append(base::FilePath(kBaseFileName));
   }
 
+  base::ScopedTempDir temp_dir_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioDebugRecordingSessionImplTest);
 };